image-mklibs: ensure sysroot is correctly set when calling gcc
[YOCTO #2519]
When getting gcc from sstate, it is possible to get a gcc with a bogus
sysroot configuration, as discussed in [1] or in [YOCTO #2519].
mklibs script will eventually call gcc, so we need to make sure that it
provides gcc with the right sysroot location.
[1] http://lists.openembedded.org/pipermail/openembedded-core/2013-September/084159.html
(From OE-Core master rev:
3a66dd762e493ad2cda57110be67c3b06628050a)
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
